Transition between ordinary and topological insulator regimes in two-dimensional resonant magnetotransport

Abstract

In the two-dimensional case the transition between ordinary and topological insulator states can be described by a massive Dirac model with the mass term changing its sign at the transition point. We theoretically investigate how such a transition manifests itself in resonant transport via localized helical edge states. The resonance occurs in the middle of the band gap due to a zero edge-state mode which is protected by the time-reversal symmetry, also when coupled to the conducting leads. We obtain the explicit dependence of the resonant conductance on the mass parameter and an external magnetic field. The proposal may be of practical use, allowing one to determine the orbital g-factor of helical edge states in two-dimensional topological insulators.

7 pages, 3 eps figures, Phys. Rev. B (in press)

References in corpus (12)

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Cited by in corpus (14)

• Weak antilocalization in HgTe quantum wells and topological surface states: Massive versus massless Dirac fermions
• Spin-helical transport in normal and superconducting topological insulators
• Transport through a quantum spin Hall quantum dot
• Generating and controlling spin-polarized currents induced by a quantum spin Hall antidot
• Nonlinear spin-thermoelectric transport in two-dimensional topological insulators
• Landau levels, edge states, and strained magnetic waveguides in graphene monolayers with enhanced spin-orbit interaction
• Probing topological transitions in HgTe/CdTe quantum wells by magneto-optical measurements
• Anomalous galvanomagnetism, cyclotron resonance and microwave spectroscopy of topological insulators
• Optical spectral weight: comparison of weak and strong spin-orbit coupling
• Particle-Hole Asymmetry in Gapped Topological Insulator Surface States
• Controlling spin polarization of a quantum dot via a helical edge state
• Two-dimensional topological insulators in quantizing magnetic fields
• Kondo Tunneling into a Quantum Spin Hall Insulator
• Anomalous Behaviour in the Magneto-Optics of a Gapped Topological Insulator